-
oa Spatial Analysis of Height Differences of Global and Regional Geoid/Quasi-geoid Models in the Polish-Ukrainian Border Zone
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, International Conference of Young Professionals «GeoTerrace-2025», Oct 2025, Volume 2025, p.1 - 5
Abstract
This study investigates the consistency of regional and global geoid and quasi-geoid models in the cross-border area between Poland and Ukraine with respect to the Baltic height system. The research addresses the problem of systematic shifts between regional solutions, referenced to the EVRF2007 system, and global gravity field models that lack a fixed vertical reference. The methodology included a comparative analysis of height differences derived from GNSS/leveling and from model-based interpolated heights. Statistical evaluation was carried out using mean, RMS, and SD indicators, and the results were further analyzed across three terrain types: flat, foothill, and mountainous. The findings demonstrate that the regional models PL-quasi-geoid2021 and EGG2015 show positive shifts relative to GNSS/leveling, while global models present smaller biases that are positive in Poland and negative in Ukraine. Systematic differences between regional and global models reach up to 0.24 m, with RMS values in the range of 0.14–0.25 m and low standard deviations of 0.01–0.05 m, confirming the internal stability of global models. Spatial analysis highlights terrain-dependent variability: global models perform more consistently in flat and foothill areas, whereas mountainous zones are characterized by greater irregularities. Among the global solutions, SGG-UGM-2 and EIGEN6C4 provide the most stable performance across all terrain types. Overall, the results indicate that global gravity field models can be used as a geometric component for quasi-geoid construction in Ukraine, provided that local corrections are applied to account for systematic offsets.
